The comet is mostly empty,

The comet is mostly empty, mostly porous. Probably all the way in, there is no bulk ice. The ice is all in the form of tiny grains.

The image clearly shows a spectacular impact.

Our analysis of data produced by Deep Impact is revealing a great deal, much of it rather surprising.

These proposed missions are very cost effective ways to provide new results that can be directly compared to the landmark Deep Impact findings as well as with the results of Deep Space 1 and Stardust.

It's no fun to protest on an empty stomach.